Mouthpiece for telephone-transmitters.



0. HFSWINGLE & A. M. MI'LTBNBERG.

MOUTHPIEGE FOR TELEPHONE TRANSMITTERS.

APPLICATION FILED JUNE 10, 1911.

Patented Feb. 27, 1912.

UNITED STATES PATENT OFFICE.

CALVIN H. SWINGLE AND ALFRED M. MILTENIBERG, OF CHICAGO, ILLINOIS.

MOUTHPIECE FOR TELEPHONE-TRANSMITT'ERS.

Specification of Letters Patent.

Application filed June 10, 1911. Serial No. 632,360.

ments in Mouthpieces for Telephone-Trans mitters, of which the following is a specification.

This invention-relates to'certain new and useful improvements in an instrument to be used for amplifying and transmitting sounds, and while it is more particularly intended as an attachment or mouthpiece for telephone transmitters of the ordinary or any preferred construction, yet it 'is applicable for use in transmitting sounds, especially vocal sounds, over wires or cords operating either mechanically or electrically, and it consists in certain peculiarities of the construction, novel arrangement, and operation of the parts thereof, as will be hereinafter more fully set forth and specifically claimed.

The principal object of the invention is to provide an instrument for transmitting sounds and more particularly vocal sounds which shall be simple and inexpensive 1n construction, strong, durable, sanitary, and efficient in operation, and so made that it may be readily attached to or removed from telephone transmitters of the ordinary construction, and when in use will concentrate, and so cause and direct sound waves within the sound-receiver .or mouth-piece, which intercepts said waves and against the diaphragm as to cause them to act more forcibly upon the latter, thus augmenting or amplifying the sounds, to the end, that slight sounds such as whispers, or those spoken in a very low tone of voice may be transmitted for a long distance and distinctly and clearly heard.

Other objects and advantages of the invention will be disclosed in the subjoined description and explanation. v

In order to enable others skilled in the art to which the invention pertains, to make and use the same we will now proceedto describe it referring to the accompanying drawing in which- Figure 1, is a sectionalview taken centrally and vertically through a mouth-piece embodying one form of the invention. Fig. 2, is a similar view of like parts illustrating a modification in its construction, and Fig.

3, is a view in side elevation of the cap or socket used for securing the mouth-piece to the transmitter casing.

Corresponding numerals of reference refer to likeparts throughout the views of the drawing.

The reference numeral 5, designates the sound-receiver or mouth-piece, which may be made of any suitable material but preferably of aluminum, and as shown, bellshaped or flaring at its outer or receiving portion. This sound-receiver or mouth Patented. Feb. 27, 1912.

piece is fitted at its smaller or discharging end, and preferably so held by friction, on

to a cap 6, which has at its periphery forwardly or outwardly disposed projections 7, which are bent inwardly to engage an annular bead 8, on the inner or smaller end of the sound-receiver. The cap or plate 6, is provided with a forwardly projecting portion 9, which is circular in shape and has its walls spaced from the walls of the mouthpiece 5, as is clearly shown in the drawing. The forwardly projecting portion 9, is provided with a series of perforations 10, through which the sound waves may pass in order to strike the diaphragm of the telephone transmitter, which diaphragm and transmitter, is not herein shown, but may be of the ordinary or any preferred construction. The perforated cap or plate 6, is provided around its annular and forwardly extended portion 9, with a circular and externally screw-threaded extension 11, to engage a suitable opening in the casing of the telephone transmitter directly in front of the diaphragm thereof.

Secured centrally to the cap or plate 6, and extended forwardly thereof is a stem 12, on the front end of which is mounted a concavo-convex member 13, which as well as the st'em 12, cap 6, and extension 11, is preferablymade of aluminum. As shown, and will be understood the member 18, is rigidly mounted at its apex on the stem 12, and has its larger end located within the mouthpiece 5, inwardly of its flared portion, yet in such a manner that its periphery will be spaced from the walls of said mouth-piece, thus furnishing a passageway for the sound waves as they are created in the flaring end of the mouth-piece and at or near the front arranged as above stated, except that the.

member 13, in this modified construction is mounted upon a stem 12 which is provided with a bend or ofi'set 14c, between itsother end will project forwardly and centrally within the mouth-piece 5, so that the member 13, thereon will be held in such a way that its periphery at its larger .end will be spaced from the walls of the mouth-piece.

In using the device, the sound waves created by the voice tones at or near the front end of the member 13, will pass between the larger end of said member and the walls of the mouth-piece and from thencethrough the openings 10, .in the cap or plate 6, and against the diaphragm, not shown, of the transmitter.

Having thus fully described our invention what we claim as new and desire to secure by Letters-Patent is 1. A mouth-piece for telephone transmitters consisting of a perforated member having means to secure it to the transmitter casing, a sound receiver mounted on the front surface of said member, a stem secured to the perforated member and extended into the sound receiver, and a concavo-convex member mounted on the free end of said stem with its open or larger end presented toward the perforated plate and at a distance from the walls of the sound receiver.

2. A mouth-piece for telephone transmitters consisting of a perforated member having on one of its surfaces a hollow extension to engage an opening in the transmitter casing and provided at its periphery with forwardly extended projections, a

sound receiver flared at its outer end and having its other end in engagement with said projections on the perforated member, astem secured to the perforated member and extended into the sound receiver, and a concavo-convex member mounted on the outer-end of said stem within the sound receiver and having its open or larger end disposed toward the perforated member and spaced from the walls of the sound receiver.

CALVIN H. SWINGLE. ALFRED M. MILTENBERG. Witnesses:

CHAs. C. TILLMAN, E. NEWSTROM. 

